doane



. 2 Sheets-Sheet 1 W. A. DOANE. Machinery for Grinding Wood forPaper-Pulp.

No. 224,002. Patented Feb. 3, 1880.

2 Invenzok %mwMW/' nPErEns, Plio'rmuiHcGRAPHER. WASHINGTON D. O.

2 2 Sheets-Sheet 2.

W. A D'OANEL Machinery for Grinding Wood for Paper-Pulp.

No. 224,002. Patented Feb. 3,1880;

Fig. 2 is a sectional side elevation.

UNITED STATES PATENT EEicE.

WILLARD DOANE, OF ROCHESTER, NEW YORK.

SPECIFICATION forming part of Letters Patent No. 224,002, dated February3, 1880.

' Application filed November 23, 1878.

To all whom it may concern:

Be it known that I, WILLARD A. DOANE, of Rochester, in the county" ofMonroe and State of New York, have invented certain useful Improvementsin Machines for Grinding Wood for Paper-Pulp; and I do hereby declarethe following to be a full and accurate description of the same,reference being had.

to the accompanying drawings, in which- Figure l is a plan View of myinvention. Figs. 3, 4, and 5 show details and modifications.

The object of my invention is to provide an automatic and self-adjustingfeeding device for wood-pulp grinders, which shall receive blocks ofvarious sizes and shapes, and feed them in a continuous mass to thegrindingsurface, the grain of the wood always lying parallel with thelatter; and it consists more especially in the employment ofcontinuouslyrevolving metallic chains or platforms having suitable lugsor teeth, which engage with the surface of the material and force itconstantly forward against a cylindrical grinder; and it furtherconsists in a method of supporting the grinding wheel or stone upon itsshaft, and in various devices for practically carrying out the moreimportant parts of the invention.

It is well known to those acquainted with the art of grinding wood forpaper-pulp that the varieties of wood generally used for that purposecontain knots, darkspots, and portions unfit for pulp, and that thesehave to be removed by sawing or splitting the wood into fragments ofvarious sizes.

In many of the machines heretofore in use the feed-Works were notarranged to receive anybut dimension stuff regularly cut or sawed, andconsequently all the material had to be reduced to the size of thesmallest block or such pieces be entirely lost.

By the coaction of the feeding devices hereinafter described I amenabled to reduce to pulp blocks of various sizes and shapes, but onedimension only being uniform, or approximately so.

A is a grinding-wheel, which I prefer to make of some close-grained hardsandstone.

B is the mainframe, having suitable bearings for the shaft '5 of thegrinding-wheel and a tank underneath the latter for receiving the pulp.G G are endless metallic belts or platforms, supported and driven bysprocketwheels D D and shafts a at. These belts are preferably made upof metallic links 0, Fig. 4, 5 5

shaped substantially as shown, so as to present to the wood a corrugatedor uneven surface, and thereby grasp it and force it along to thegrinding-surface.

The sprockets D D are made to conform to the inner surface of the beltsfor the purpose of driving them.

I prefer to use two of these belts together, as indicated in Fig. 2,between which the wood is forced to the grinding-surface; but one beltonly may be used, the other being replaced by a smooth bed-plate orchannel, along which the wood is forced by the corrugations of the belt.The set of shafts a, driving the lower belt, have stationary hearings inthe secondary frame E, attached to the main frame by bolts throughslots, as indicated in Fig. l, and the shafts a of the upper belt arejournaled in boxes 6, made vertically adjustable in a second frame, F,which is attached to frame E in the same manner as E is to main frame. Ihave shown two sets of these endless belts lying side by side andarranged to feed against the same grinding-surface but it may beadvisable to use four or six sets together, either of the same ordifferent widths, to accommodate blocks of various lengths, the totalspace occupied being about equal to the length of thegrindii'ig-surface, and when so duplicated or multiplied the shafts toextend through and carry all of the lower sprockets, D, while the uppershafts are separate and independent for each belt 0. These shafts andfeeders maybe driven as follows: Power is conveyed to the wheel fon oneof the non-adjustable shafts'a. 0

in any suitable way, so that its speed shall cor-' respond with thegrinding capacity of the stone.

Ff rom this shaft the counter-shafts g 70 are driven feeder O isindependent of every other, and

that each willadjustitself to variations in the size of the blocks fedin, the weight of the The counter-shaft 5 ized in securing a sutficientadherence of the corrugations to the material to feed it along.

Byjudiciously proportioning the width of the belts O 0, when severalpairs are used in the same machine, each pair may be used for blocks ofa certain length; or they may be wide enough to receive several lengthsof blocks together, the depth or thickness only being uniform, or nearlyso, thus providing for the working up of stock of almost any size orform. If for any reason the weight of the belts and wheels should not besuflicient to force in the stock, weighted levers may be placed over theboxes 0.

A bed-plate, d, for supporting the blocks against the grindin'gsurface,is secured to the lower adjustable frame, E, and a corresponding guide-plate, d, is attached to the frame F. Thus all these parts may beadjusted to the stone as it wears away, the feeders O O advancingequally and retaining their relative position to the plates at d.

The sprocketsDD are provided with flanges 0, Fig. 2, to prevent thebelts from getting out of line and if desirable these flanges may extendsomewhat beyond the surface of the belts, as shown in Fig.1, so as toform a channel, down which the blocks pass.

H H is a set of chains and sprockets, arranged on the side of the axis topposite the feeders O C, said chains being provided with lugs h atsuitable intervals for the purpose of engaging with and forcing in theblocks presented to them. The upper and lower sets of sprocket shaftsare boxed, respectively, in frames E F in the same manner as the shaftsa a, and these frames are similarly adjustable on the main frame B.Grinding bed-plates l l are also provided on these frames, similar to dd. I prefer to have this set of feeders occupy the entire width of thegrinding-surface, so as to receive sticks as long as the inside width ofthe frame B, or thereabout; but two or more sets'of such chains may beused, as may be deemed desirable. Guide-bars m are attached to the frameB at or near the upper surface of the chains H, upon which the ends ofthe sticks rest as they are fed to the grind ing-surface.

The object of this arrangement is to receive and feed irregular or splitwood, as indicated in Fig. 2, the length being the only essentialdimension, and that not necessarily exact. The sticks are laid upon thelower set of chains with the grain parallel to the periphery of thegrinding-cylinder, or nearly so, and the lugs h force the masscontinuously toward the v grinding-surface. As the lugs reach the plates1 l they pass through slots therein, and, being rounded at theirextremity, they pass away from the sticks at that point withoutinterferin g with the continuous movement ofthe mass.

Thus it will be seen that by the combination of the devices for feedingthe material above described I am enabled to utilize and reduce to pulpall of the fragments into which it is necessary to cut the stock withoutbeing obliged to render it into blocksof uniform size, and, furthermore,that the material is presented to the grinding-cylinder upon both sidesof its axis in a continuous mass, which may be replenished from time totime as it is ground away without intermitting the feedin g action.

One pair of chains, H, only may be used if desirable, the other beingreplaced by a smooth plate or channel, as mentioned with reference tothe platforms 0 C.

When long sawed blocks are to be pulped A great objection heretoforeexisting to the fluted slats h, Fig. 5, may be attached to the use ofsandstone as a grinding medium has been the difliculty of obtainingblocks of sufficient size that were homogeneous in texture.

.To obviate this trouble, and at the same time provide a securefastening of the stone to the shaft, I provide large plates I, Figs. 2and 3, securely bolted to the ends of the cylinder of sandstone by bolts1*,passingentirely through the latter, and the cylinder may be made upof several longitudinal sections or disks, either placed with theirfaces in contact or plates I placed between them, as indicated in Fig.3, the bolts binding the whole firmly together. The plates I are fittedto the shaft t' and are rigidly secured thereto in any suitable manner.A circular flange, 0, is formed upon the plates I, which projects intoand exactly fits a groove cut in the sections of stone. A square boss,8, is also provided at the center of the plate I, which is fitted into acorresponding recess in the eye of the stone.

The boss 8 and bolts 1* operate to drive the stone circumferentially,assisted by the fric tion of the plates and flanges 0, while the lat tersupport the sections in exact centrality to the axis and in relation toeach other, and at the same time act as bands to prevent bursting.

This construction can also be applied to ad vantage to stones cut from asingle block.

When it is desirable to have a continuous grinding-surface the plates Imay be let into the disks and the faces of latter thus brought together.i

What I claim as my invention, and desire to secure by Letters Patent,is-

1. In combination with a cylindrical grinding stone or wheel, one ormore continuouslyrevolving chains or belts provided with lugs orprojections for engaging directly with the material to be reduced topulpand forcing it against the grinding-surface, substantially as described.l r

2. In combination with a cylindrical grind ing stone or wheel, theendless revolving corrugated platform or platforms 0 0, arranged toreceive the wood and feed it in a continuous mass to thegrinding-surface, substantially as set forth.

3. In a wood-pulping machine, the endless feeding belt or platformcomposed of links 0, having projections on their edges for engaging withthe surface of the wood, substantially as set forth.

4. In combination with the endless revolving-feeding platformO thesecondary feeding chains or belts O and sprockets D, the shafts of whichare free to move vertically and permit the passage of blocks of varioussizes, sub stantially as set forth.

5. In combination with a grinding wheel or stone and endless revolvingplatform or platforms 0, the chain-feeders. H H, provided with lugs h,and the guide-bars m, for feeding irregular and split sticks,substantially as set forth.

6. In combination with the self -adjusting feeding platforms or belts G,the countershaft g and sprockets or pulleys 19, driven in any convenientmanner from the main feed-shaft a, for the purposes set forth. 7. Incombination with the feeding mechanism G C a a, the connecting-shaft Jand gears, arranged to operate the feeding-chains H, substantially inthe manner set forth.

8. A cylindrical grinding stone or wheel composed of two or morelongitudinal sections or disks supported and driven by plates I andflanges 0 thereon, such plates being placed at the ends of cylinder orbetween the sections, or both, substantially as and for the purposes setforth.

9. As an improvement in hanging stones for grinding wood-pulp, theflanges I, provided with flanges 0 and square boss 8, said plates beingsecured tothe stone and to each other by bolts r, substantially as andfor the purposes set forth. I

WILLARD A. DOANE.

Witnesses: V

DAVID J. BROTHERS, GEORGE W. LANE.

